On sailplanes, spoilers are generally located at or near the spar. They come up to create drag to help slow the plane and to decrease the lift of the wing in this area.

As stated above, spoilerons are a function provided by a computer radio that turns both ailerons up. Not as effective as the top mounted spoilers, or so I am told, but they do have an impact and help to settle the plane down in a shorter distance.

Photo is of one of my sailplanes with spoilers rasied.